Question:

Should I wrap the exhaust manifold on my RIOT? The engine is rear mounted and I have the Sylva Stainless Exhaust.

Basically the fibreglass engine cover gets really hot above the manifold and I thought about wrapping the bits under the cover to reduce the temperature.

I have researched the 'net where some say it's ok to do and others say it's dangerous?

Does anyone have any experience of using it?

Out of interest why do they say its dangerous?

Apparently if it has gaps in then there is extreme heat release which causes a fire.

Just wrap it.. it will be fine

Mines wrapped, more for cosmetic reasons than anything else, and I haven't had any problems. Just make sure it is good quality thick stuff. IMO black is the best colour to buy as you don't end up with scorch marks...

You will find the can gets hotter than before.

Yes - the pipe gets much hotter further down the line. Not really a problem unless you're worried about people touching the lower extremities of the exhaust system.

Thanks for your replies.

I'll get some wrap (probably in black) and watch out for the hot can.

I've heard it's a bad idea in a Fury (not really relevant for you ) because it moves the heat out of the engine bay and into the enclosed side pod, where the increased temperatures can melt and set fire to the fibreglass.

Stainless steel is weak when hot.

Subjecting the manifold to increased temperatures increases the likelihood of contraction cracks
as it cools. (Depending on design, bracing, or lack of, and grade of material.)

Just my 2p.

Paul G

quote:

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Originally posted by 907
Stainless steel is weak when hot.

Subjecting the manifold to increased temperatures increases the likelihood of contraction cracks
as it cools. (Depending on design, bracing, or lack of, and grade of material.)

Just my 2p.

Paul G

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It's a good thing to do, it reduces under bonnet temps and increases exhaust gas speeds. If your air intake is in the bay then the colder intake temps will aid power and the increased gas speed will help cylinder scavenging and thus you may make better power if correctly fueled!

The only way its dangerous is if you have an oil issue in the engine bay, then the wrapping soaks it up nicely. If you have any igniting then it acts like a wick!

You don't want to know why i know......

I spoke to Simpson race exhausts about this and they said it was a bad idea to wrap exhaust as the heat can't escape and can sap power

quote:

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Originally posted by Johneturbo
I spoke to Simpson race exhausts about this and they said it was a bad idea to wrap exhaust as the heat can't escape and can sap power

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Here's my view from a post i put on this site a short while ago

Will i use exhaust wrap again?? NO



Exhaust leek

I was going to post a question about why my car always pops and bangs on the over run, but ive found out why!

I had noticed a small burn to the exhaust wrap, so it was obviousley a small hole in the manifold

So today i whipped the manifold off for a quick and easy repair, BUT NOT!

under the wrap, was a crack about 80% all the way round the manifold, and the stongest thing holding it all together was the exhaust wrap and wire and 20% of fatiged metal

Well, that was a lucky find, as i doubt it would of lasted much longer, and this would of resulted in my lower downpipe coming out of the side of the car, hitting the ground, and removing the whole downpipe, exhaust and silencer off the car
This would also proberly of taken out my nearside alui side panel, and rear wheelarch !!

I am soooo glad i did this job today (between nightshifts!) as i really wasnt going to bother untill the burn mark got worse

Steve

Even after wrapping mine the heat coming up to the bonnet was still higher than I would like partic. as the clutch cable runs over the ex. manifold.
I bought some fire-board (used for soffits) from the local builder's merchant, cut it to shape and used two big tool clips to mount it to the outer exhaust headers.
Seems to disperse the heat quite well though it needs replacing every year or so. Improved it's longevity by putting packing pieces of soffit between the board and clips.
Can send pics if you need them.
HTH.
Cheers, Pewe

I've used heat wrap and it eventually just dries and cracks up - I had my manifold ceramic coated by Camcoat not too expensive , reduced the heat and looks good

Not sure if it's worth the bother on a riot personally as the exhaust is out of the back before you know it,



What do other riot owners do/recommend?

[Edited on 2/1/12 by iank]

Heat shielding on the bonnet to prevent warping?

On mine I have a aluminium heat shield on the headers (and turbo) and have bonded some heat reflective mat onto the underside of the 'bonnet'. Without the mat the bonnet surface got to 98degC even after 'gentle' run.



this stuff is well priced and works http://www.nfauto.co.uk/heatmat.htm to my mind it looks good too.


Worth doing the heat mat whether you wrap of not.

Matt